History of the Peloponnesian War

Being now come into Thrace, the Athenians upon notice thereof declared Perdiccas an enemy, as imputing to him this expedition, and reinforced the garrisons in the parts thereabouts.

Perdiccas with Brasidas and his army, together with his own forces, marched presently against Arrhibaeus, the son of Bromerus, king of the Lyncesteans, a people of Macedonia, confining on Perdiccas his dominion, both for a quarrel they had against him and also as desiring to subdue him.

When he came with his army, and Brasidas with him, to the place where they were to have fallen in, Brasidas told him that he desired, before he made war, to draw Arrhibaeus by parley, if he could, to a league with the Lacedaemonians.